Great: Pakistan's security service is main trainer and supplier for Taliban

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Reuters:

Pakistan's security service provides weapons and training to Taliban insurgents fighting U.S. and British troops in Afghanistan, despite official denials, Taliban commanders say, in allegations that could worsen tensions between Pakistan and the United States. 

A number of middle-ranking Taliban commanders revealed the extent of Pakistani support in interviews for a BBC Two documentary series, "Secret Pakistan," the first part of which was being broadcast on Wednesday.

A former head of Afghan intelligence also told the program that Afghanistan gave Pakistan's former president, Gen. Pervez Musharraf, information in 2006 that Osama bin Laden was hiding in northern Pakistan close to where the former al Qaeda leader was eventually killed by U.S. special forces in May.

...According to a commander using the name Mullah Azizullah, the experts running the training are either members of the ISI or have close links to it.

"They are all the ISI's men. They are the ones who run the training. First they train us about bombs; then they give us practical guidance," he said.